C64700
Nickel-Silicon Bronze
Heat-treatable copper-nickel-silicon alloy. Age hardening roughly doubles its strength while keeping useful electrical conductivity.
Tensile Strength
50–100 ksi
Yield Strength
20–80 ksi
Machinability
30 / 100
Density
0.318 lb/in³
Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| Copper (Cu) | — | Remainder |
| Nickel (Ni) | 1.6 | 2.2 |
| Silicon (Si) | 0.4 | 0.8 |
| Zinc (Zn) | — | 0.5 |
| Iron (Fe) | — | 0.1 |
Physical Properties
| Density | 0.318 lb/cu in |
|---|---|
| Specific Gravity | 8.81 |
| Melting Point (Solidus) | 1940°F |
| Melting Point (Liquidus) | 1985°F |
| Electrical Conductivity | 40% IACS |
Mechanical Properties
| Tensile Strength | 50–100 ksi |
|---|---|
| Yield Strength | 20–80 ksi |
| Elongation | 6–32% |
| Hardness | 25–95 Rockwell B |
| Machinability Rating | 30 |
Thermal Properties
| Thermal Conductivity | 75 Btu/ft·hr·°F |
|---|---|
| Coefficient of Expansion | 9.9 × 10⁻⁶ /°F |
| Specific Heat | 0.09 Btu/lb·°F |
Fabrication Properties
Soldering
Brazing
Oxyacetylene Welding
Gas Shielded Arc
Coated Metal Arc
Cold Working
Hot Forming
Typical Applications
- High-strength fasteners
- Electrical connectors
- Spring components
- Valve stems
- Small-diameter bushings
- Aerospace hardware
Applicable Specifications
- ASTM B411
- SAE J461
- SAE J463
Frequently Asked Questions
Common questions about C64700 Nickel-Silicon Bronze specifications, applications, and material properties.